[单项选择]In the past, American families tended to be quite large. Families with five or more children were 1. Over the years the size of the family has 2. One reason for this is an increase in the cost of living. 3 average, children attend schools for more years than they used to. 4, children nowadays are better dressed and have more money to 5 on entertainment. Parents usually take the responsibility for all the expenses. At the same time, families are less close than they 6. The divorce rate is now on the rise. The breakup of the family occurs 7 the parents divorce. A lot of children in the United States live part of their young lives with only one parent. Broken families 8 result in problems. Children grow up 9 uneasy as they move back and forth between parents. Single parents often 10 other single parents. In this type of families, children often have difficulties in establishing new relationships with their stepbrothers or stepsisters.
A. when
B. as
C. where
D. since

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